1 /* 2 * Copyright (c) 1990 William F. Jolitz, TeleMuse 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This software is a component of "386BSD" developed by 16 * William F. Jolitz, TeleMuse. 17 * 4. Neither the name of the developer nor the name "386BSD" 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 22 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 23 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 24 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 25 * NOT MAKE USE OF THIS WORK. 26 * 27 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 28 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 29 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 30 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 31 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 32 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 33 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 34 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 * 48 * from: unknown origin, 386BSD 0.1 49 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 50 * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp 51 * $FreeBSD: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien Exp $ 52 * $DragonFly: src/sys/dev/misc/lpt/lpt.c,v 1.10 2004/09/19 00:23:33 dillon Exp $ 53 */ 54 55 /* 56 * Device Driver for AT parallel printer port 57 * Written by William Jolitz 12/18/90 58 */ 59 60 /* 61 * Updated for ppbus by Nicolas Souchu 62 * [Mon Jul 28 1997] 63 */ 64 65 #include "opt_lpt.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/module.h> 70 #include <sys/bus.h> 71 #include <sys/conf.h> 72 #include <sys/kernel.h> 73 #include <sys/uio.h> 74 #include <sys/syslog.h> 75 #include <sys/malloc.h> 76 77 #include <machine/clock.h> 78 #include <machine/bus.h> 79 #include <machine/resource.h> 80 #include <sys/rman.h> 81 82 #include "lptio.h" 83 #include <bus/ppbus/ppbconf.h> 84 #include <bus/ppbus/ppb_1284.h> 85 #include "lpt.h" 86 #include "ppbus_if.h" 87 #include <bus/ppbus/ppbio.h> 88 89 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 90 91 #ifndef LPT_DEBUG 92 #define lprintf(args) 93 #else 94 #define lprintf(args) \ 95 do { \ 96 if (lptflag) \ 97 printf args; \ 98 } while (0) 99 static int volatile lptflag = 1; 100 #endif 101 102 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 103 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 104 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 105 #define BUFSIZE 1024 106 #define BUFSTATSIZE 32 107 108 #define LPTUNIT(s) ((s)&0x03) 109 #define LPTFLAGS(s) ((s)&0xfc) 110 111 struct lpt_data { 112 short sc_state; 113 /* default case: negative prime, negative ack, handshake strobe, 114 prime once */ 115 u_char sc_control; 116 char sc_flags; 117 #define LP_UNITMASK 0x03 /* up to 4 units */ 118 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 119 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 120 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 121 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 122 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 123 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 124 void *sc_inbuf; 125 void *sc_statbuf; 126 short sc_xfercnt ; 127 char sc_primed; 128 char *sc_cp ; 129 u_short sc_irq ; /* IRQ status of port */ 130 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 131 #define LP_USE_IRQ 0x02 /* we are using our irq */ 132 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 133 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 134 u_char sc_backoff ; /* time to call lptout() again */ 135 136 struct resource *intr_resource; /* interrupt resource */ 137 void *intr_cookie; /* interrupt registration cookie */ 138 struct callout sc_callout; 139 }; 140 141 #define LPT_NAME "lpt" /* our official name */ 142 143 static timeout_t lptout; 144 static int lpt_port_test(device_t dev, u_char data, u_char mask); 145 static int lpt_detect(device_t dev); 146 147 #define DEVTOSOFTC(dev) \ 148 ((struct lpt_data *)device_get_softc(dev)) 149 #define UNITOSOFTC(unit) \ 150 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 151 #define UNITODEVICE(unit) \ 152 (devclass_get_device(lpt_devclass, (unit))) 153 154 static void lptintr(device_t dev); 155 static void lpt_intr(void *arg); /* without spls */ 156 157 static devclass_t lpt_devclass; 158 159 160 /* bits for state */ 161 #define OPEN (1<<0) /* device is open */ 162 #define ASLP (1<<1) /* awaiting draining of printer */ 163 #define EERROR (1<<2) /* error was received from printer */ 164 #define OBUSY (1<<3) /* printer is busy doing output */ 165 #define LPTOUT (1<<4) /* timeout while not selected */ 166 #define TOUT (1<<5) /* timeout while not selected */ 167 #define LPTINIT (1<<6) /* waiting to initialize for open */ 168 #define INTERRUPTED (1<<7) /* write call was interrupted */ 169 170 #define HAVEBUS (1<<8) /* the driver owns the bus */ 171 172 173 /* status masks to interrogate printer status */ 174 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 175 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 176 177 /* Printer Ready condition - from lpa.c */ 178 /* Only used in polling code */ 179 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 180 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 181 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 182 183 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 184 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 185 186 187 static d_open_t lptopen; 188 static d_close_t lptclose; 189 static d_write_t lptwrite; 190 static d_read_t lptread; 191 static d_ioctl_t lptioctl; 192 193 #define CDEV_MAJOR 16 194 static struct cdevsw lpt_cdevsw = { 195 /* name */ LPT_NAME, 196 /* maj */ CDEV_MAJOR, 197 /* flags */ 0, 198 /* port */ NULL, 199 /* clone */ NULL, 200 201 /* open */ lptopen, 202 /* close */ lptclose, 203 /* read */ lptread, 204 /* write */ lptwrite, 205 /* ioctl */ lptioctl, 206 /* poll */ nopoll, 207 /* mmap */ nommap, 208 /* strategy */ nostrategy, 209 /* dump */ nodump, 210 /* psize */ nopsize 211 }; 212 213 static int 214 lpt_request_ppbus(device_t dev, int how) 215 { 216 device_t ppbus = device_get_parent(dev); 217 struct lpt_data *sc = DEVTOSOFTC(dev); 218 int error; 219 220 if (sc->sc_state & HAVEBUS) 221 return (0); 222 223 /* we have the bus only if the request succeded */ 224 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 225 sc->sc_state |= HAVEBUS; 226 227 return (error); 228 } 229 230 static int 231 lpt_release_ppbus(device_t dev) 232 { 233 device_t ppbus = device_get_parent(dev); 234 struct lpt_data *sc = DEVTOSOFTC(dev); 235 int error = 0; 236 237 if ((error = ppb_release_bus(ppbus, dev)) == 0) 238 sc->sc_state &= ~HAVEBUS; 239 240 return (error); 241 } 242 243 /* 244 * Internal routine to lptprobe to do port tests of one byte value 245 */ 246 static int 247 lpt_port_test(device_t ppbus, u_char data, u_char mask) 248 { 249 int temp, timeout; 250 251 data = data & mask; 252 ppb_wdtr(ppbus, data); 253 timeout = 10000; 254 do { 255 DELAY(10); 256 temp = ppb_rdtr(ppbus) & mask; 257 } 258 while (temp != data && --timeout); 259 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 260 return (temp == data); 261 } 262 263 /* 264 * Probe simplified by replacing multiple loops with a hardcoded 265 * test pattern - 1999/02/08 des@freebsd.org 266 * 267 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 268 * Based partially on Rod Grimes' printer probe 269 * 270 * Logic: 271 * 1) If no port address was given, use the bios detected ports 272 * and autodetect what ports the printers are on. 273 * 2) Otherwise, probe the data port at the address given, 274 * using the method in Rod Grimes' port probe. 275 * (Much code ripped off directly from Rod's probe.) 276 * 277 * Comments from Rod's probe: 278 * Logic: 279 * 1) You should be able to write to and read back the same value 280 * to the data port. Do an alternating zeros, alternating ones, 281 * walking zero, and walking one test to check for stuck bits. 282 * 283 * 2) You should be able to write to and read back the same value 284 * to the control port lower 5 bits, the upper 3 bits are reserved 285 * per the IBM PC technical reference manauls and different boards 286 * do different things with them. Do an alternating zeros, alternating 287 * ones, walking zero, and walking one test to check for stuck bits. 288 * 289 * Some printers drag the strobe line down when the are powered off 290 * so this bit has been masked out of the control port test. 291 * 292 * XXX Some printers may not like a fast pulse on init or strobe, I 293 * don't know at this point, if that becomes a problem these bits 294 * should be turned off in the mask byte for the control port test. 295 * 296 * We are finally left with a mask of 0x14, due to some printers 297 * being adamant about holding other bits high ........ 298 * 299 * Before probing the control port, we write a 0 to the data port - 300 * If not, some printers chuck out garbage when the strobe line 301 * gets toggled. 302 * 303 * 3) Set the data and control ports to a value of 0 304 * 305 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 306 * Epson FX-1170 and C.Itoh 8510RM 307 * printers. 308 * Quick exit on fail added. 309 */ 310 static int 311 lpt_detect(device_t dev) 312 { 313 device_t ppbus = device_get_parent(dev); 314 315 static u_char testbyte[18] = { 316 0x55, /* alternating zeros */ 317 0xaa, /* alternating ones */ 318 0xfe, 0xfd, 0xfb, 0xf7, 319 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 320 0x01, 0x02, 0x04, 0x08, 321 0x10, 0x20, 0x40, 0x80 /* walking one */ 322 }; 323 int i, error, status; 324 325 status = 1; /* assume success */ 326 327 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 328 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 329 status = 0; 330 goto end_probe; 331 } 332 333 for (i = 0; i < 18 && status; i++) 334 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 335 status = 0; 336 goto end_probe; 337 } 338 339 end_probe: 340 /* write 0's to control and data ports */ 341 ppb_wdtr(ppbus, 0); 342 ppb_wctr(ppbus, 0); 343 344 lpt_release_ppbus(dev); 345 346 return (status); 347 } 348 349 static void 350 lpt_identify(driver_t *driver, device_t parent) 351 { 352 353 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 354 } 355 356 /* 357 * lpt_probe() 358 */ 359 static int 360 lpt_probe(device_t dev) 361 { 362 struct lpt_data *sc; 363 364 sc = DEVTOSOFTC(dev); 365 bzero(sc, sizeof(struct lpt_data)); 366 367 /* 368 * Now, try to detect the printer. 369 */ 370 if (!lpt_detect(dev)) 371 return (ENXIO); 372 373 device_set_desc(dev, "Printer"); 374 375 return (0); 376 } 377 378 static int 379 lpt_attach(device_t dev) 380 { 381 device_t ppbus = device_get_parent(dev); 382 struct lpt_data *sc = DEVTOSOFTC(dev); 383 int zero = 0, unit = device_get_unit(dev); 384 int error; 385 uintptr_t irq; 386 387 sc->sc_primed = 0; /* not primed yet */ 388 callout_init(&sc->sc_callout); 389 390 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 391 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 392 return (0); 393 } 394 395 ppb_wctr(ppbus, LPC_NINIT); 396 397 /* check if we can use interrupt, should be done by ppc stuff */ 398 lprintf(("oldirq %x\n", sc->sc_irq)); 399 400 /* retrieve the ppbus irq */ 401 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 402 403 if (irq > 0) { 404 /* declare our interrupt handler */ 405 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 406 &zero, irq, irq, 1, RF_SHAREABLE); 407 } 408 if (sc->intr_resource) { 409 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 410 device_printf(dev, "Interrupt-driven port\n"); 411 } else { 412 sc->sc_irq = 0; 413 device_printf(dev, "Polled port\n"); 414 } 415 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 416 417 lpt_release_ppbus(dev); 418 419 cdevsw_add(&lpt_cdevsw, LP_UNITMASK, unit); 420 make_dev(&lpt_cdevsw, unit, 421 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 422 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 423 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 424 return (0); 425 } 426 427 static void 428 lptout(void *arg) 429 { 430 device_t dev = (device_t)arg; 431 struct lpt_data *sc = DEVTOSOFTC(dev); 432 #ifdef LPT_DEBUG 433 device_t ppbus = device_get_parent(dev); 434 #endif 435 436 lprintf(("T %x ", ppb_rstr(ppbus))); 437 if (sc->sc_state & OPEN) { 438 sc->sc_backoff++; 439 if (sc->sc_backoff > hz/LPTOUTMAX) 440 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 441 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); 442 } else { 443 sc->sc_state &= ~TOUT; 444 } 445 446 if (sc->sc_state & EERROR) 447 sc->sc_state &= ~EERROR; 448 449 /* 450 * Avoid possible hangs due to missed interrupts 451 */ 452 if (sc->sc_xfercnt) { 453 lptintr(dev); 454 } else { 455 sc->sc_state &= ~OBUSY; 456 wakeup((caddr_t)dev); 457 } 458 } 459 460 /* 461 * lptopen -- reset the printer, then wait until it's selected and not busy. 462 * If LP_BYPASS flag is selected, then we do not try to select the 463 * printer -- this is just used for passing ioctls. 464 */ 465 466 static int 467 lptopen(dev_t dev, int flags, int fmt, struct thread *p) 468 { 469 int s; 470 int trys, err; 471 u_int unit = LPTUNIT(minor(dev)); 472 struct lpt_data *sc = UNITOSOFTC(unit); 473 device_t lptdev = UNITODEVICE(unit); 474 device_t ppbus = device_get_parent(lptdev); 475 476 if (!sc) 477 return (ENXIO); 478 479 if (sc->sc_state) { 480 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 481 return(EBUSY); 482 } else 483 sc->sc_state |= LPTINIT; 484 485 sc->sc_flags = LPTFLAGS(minor(dev)); 486 487 /* Check for open with BYPASS flag set. */ 488 if (sc->sc_flags & LP_BYPASS) { 489 sc->sc_state = OPEN; 490 return(0); 491 } 492 493 /* request the ppbus only if we don't have it already */ 494 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 495 /* give it a chance to try later */ 496 sc->sc_state = 0; 497 return (err); 498 } 499 500 s = spltty(); 501 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 502 503 /* set IRQ status according to ENABLE_IRQ flag 504 */ 505 if (sc->sc_irq & LP_ENABLE_IRQ) 506 sc->sc_irq |= LP_USE_IRQ; 507 else 508 sc->sc_irq &= ~LP_USE_IRQ; 509 510 /* init printer */ 511 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 512 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 513 ppb_wctr(ppbus, 0); 514 sc->sc_primed++; 515 DELAY(500); 516 } 517 } 518 519 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 520 521 /* wait till ready (printer running diagnostics) */ 522 trys = 0; 523 do { 524 /* ran out of waiting for the printer */ 525 if (trys++ >= LPINITRDY*4) { 526 splx(s); 527 sc->sc_state = 0; 528 lprintf(("status %x\n", ppb_rstr(ppbus))); 529 530 lpt_release_ppbus(lptdev); 531 return (EBUSY); 532 } 533 534 /* wait 1/4 second, give up if we get a signal */ 535 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 536 EWOULDBLOCK) { 537 sc->sc_state = 0; 538 splx(s); 539 540 lpt_release_ppbus(lptdev); 541 return (EBUSY); 542 } 543 544 /* is printer online and ready for output */ 545 } while ((ppb_rstr(ppbus) & 546 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 547 (LPS_SEL|LPS_NBSY|LPS_NERR)); 548 549 sc->sc_control = LPC_SEL|LPC_NINIT; 550 if (sc->sc_flags & LP_AUTOLF) 551 sc->sc_control |= LPC_AUTOL; 552 553 /* enable interrupt if interrupt-driven */ 554 if (sc->sc_irq & LP_USE_IRQ) 555 sc->sc_control |= LPC_ENA; 556 557 ppb_wctr(ppbus, sc->sc_control); 558 559 sc->sc_state = OPEN; 560 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 561 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 562 sc->sc_xfercnt = 0; 563 splx(s); 564 565 /* release the ppbus */ 566 lpt_release_ppbus(lptdev); 567 568 /* only use timeout if using interrupt */ 569 lprintf(("irq %x\n", sc->sc_irq)); 570 if (sc->sc_irq & LP_USE_IRQ) { 571 sc->sc_state |= TOUT; 572 sc->sc_backoff = hz / LPTOUTINITIAL; 573 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); 574 } 575 576 lprintf(("opened.\n")); 577 return(0); 578 } 579 580 /* 581 * lptclose -- close the device, free the local line buffer. 582 * 583 * Check for interrupted write call added. 584 */ 585 586 static int 587 lptclose(dev_t dev, int flags, int fmt, struct thread *p) 588 { 589 u_int unit = LPTUNIT(minor(dev)); 590 struct lpt_data *sc = UNITOSOFTC(unit); 591 device_t lptdev = UNITODEVICE(unit); 592 device_t ppbus = device_get_parent(lptdev); 593 int err; 594 595 if(sc->sc_flags & LP_BYPASS) 596 goto end_close; 597 598 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 599 return (err); 600 601 sc->sc_state &= ~OPEN; 602 603 /* if the last write was interrupted, don't complete it */ 604 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) { 605 while ((ppb_rstr(ppbus) & 606 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 607 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) { 608 /* wait 1/4 second, give up if we get a signal */ 609 if (tsleep((caddr_t)lptdev, PCATCH, 610 "lpclose", hz) != EWOULDBLOCK) { 611 break; 612 } 613 } 614 } 615 callout_stop(&sc->sc_callout); 616 ppb_wctr(ppbus, LPC_NINIT); 617 free(sc->sc_inbuf, M_LPT); 618 free(sc->sc_statbuf, M_LPT); 619 620 end_close: 621 /* release the bus anyway 622 * unregistration of interrupt forced by release 623 */ 624 lpt_release_ppbus(lptdev); 625 626 sc->sc_state = 0; 627 sc->sc_xfercnt = 0; 628 lprintf(("closed.\n")); 629 return(0); 630 } 631 632 /* 633 * lpt_pushbytes() 634 * Workhorse for actually spinning and writing bytes to printer 635 * Derived from lpa.c 636 * Originally by ? 637 * 638 * This code is only used when we are polling the port 639 */ 640 static int 641 lpt_pushbytes(device_t dev) 642 { 643 struct lpt_data *sc = DEVTOSOFTC(dev); 644 device_t ppbus = device_get_parent(dev); 645 int spin, err, tic; 646 char ch; 647 648 lprintf(("p")); 649 /* loop for every character .. */ 650 while (sc->sc_xfercnt > 0) { 651 /* printer data */ 652 ch = *(sc->sc_cp); 653 sc->sc_cp++; 654 sc->sc_xfercnt--; 655 656 /* 657 * Wait for printer ready. 658 * Loop 20 usecs testing BUSY bit, then sleep 659 * for exponentially increasing timeout. (vak) 660 */ 661 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 662 DELAY(1); /* XXX delay is NOT this accurate! */ 663 if (spin >= MAX_SPIN) { 664 tic = 0; 665 while (NOT_READY(ppbus)) { 666 /* 667 * Now sleep, every cycle a 668 * little longer .. 669 */ 670 tic = tic + tic + 1; 671 /* 672 * But no more than 10 seconds. (vak) 673 */ 674 if (tic > MAX_SLEEP) 675 tic = MAX_SLEEP; 676 err = tsleep((caddr_t)dev, 0, 677 LPT_NAME "poll", tic); 678 if (err != EWOULDBLOCK) { 679 return (err); 680 } 681 } 682 } 683 684 /* output data */ 685 ppb_wdtr(ppbus, ch); 686 /* strobe */ 687 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 688 ppb_wctr(ppbus, sc->sc_control); 689 690 } 691 return(0); 692 } 693 694 /* 695 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 696 */ 697 698 static int 699 lptread(dev_t dev, struct uio *uio, int ioflag) 700 { 701 u_int unit = LPTUNIT(minor(dev)); 702 struct lpt_data *sc = UNITOSOFTC(unit); 703 device_t lptdev = UNITODEVICE(unit); 704 device_t ppbus = device_get_parent(lptdev); 705 int error = 0, len; 706 707 if (sc->sc_flags & LP_BYPASS) { 708 /* we can't do reads in bypass mode */ 709 return (EPERM); 710 } 711 712 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 713 return (error); 714 715 /* read data in an other buffer, read/write may be simultaneous */ 716 len = 0; 717 while (uio->uio_resid) { 718 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 719 sc->sc_statbuf, min(BUFSTATSIZE, 720 uio->uio_resid), &len))) { 721 goto error; 722 } 723 724 if (!len) 725 goto error; /* no more data */ 726 727 if ((error = uiomove(sc->sc_statbuf, len, uio))) 728 goto error; 729 } 730 731 error: 732 ppb_1284_terminate(ppbus); 733 return (error); 734 } 735 736 /* 737 * lptwrite --copy a line from user space to a local buffer, then call 738 * putc to get the chars moved to the output queue. 739 * 740 * Flagging of interrupted write added. 741 */ 742 743 static int 744 lptwrite(dev_t dev, struct uio *uio, int ioflag) 745 { 746 unsigned n; 747 int err; 748 u_int unit = LPTUNIT(minor(dev)); 749 struct lpt_data *sc = UNITOSOFTC(unit); 750 device_t lptdev = UNITODEVICE(unit); 751 device_t ppbus = device_get_parent(lptdev); 752 753 if(sc->sc_flags & LP_BYPASS) { 754 /* we can't do writes in bypass mode */ 755 return(EPERM); 756 } 757 758 /* request the ppbus only if we don't have it already */ 759 /* XXX interrupt registration?! */ 760 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 761 return (err); 762 763 /* if interrupts are working, register the handler */ 764 if (sc->sc_irq & LP_USE_IRQ) { 765 /* register our interrupt handler */ 766 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 767 INTR_TYPE_TTY, lpt_intr, lptdev, 768 &sc->intr_cookie); 769 if (err) { 770 device_printf(lptdev, "handler registration failed, polled mode.\n"); 771 sc->sc_irq &= ~LP_USE_IRQ; 772 } 773 } 774 775 sc->sc_state &= ~INTERRUPTED; 776 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 777 sc->sc_cp = sc->sc_inbuf; 778 uiomove(sc->sc_cp, n, uio); 779 sc->sc_xfercnt = n ; 780 781 if (sc->sc_irq & LP_ENABLE_EXT) { 782 /* try any extended mode */ 783 err = ppb_write(ppbus, sc->sc_cp, 784 sc->sc_xfercnt, 0); 785 switch (err) { 786 case 0: 787 /* if not all data was sent, we could rely 788 * on polling for the last bytes */ 789 sc->sc_xfercnt = 0; 790 break; 791 case EINTR: 792 sc->sc_state |= INTERRUPTED; 793 return(err); 794 case EINVAL: 795 /* advanced mode not avail */ 796 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 797 break; 798 default: 799 return(err); 800 } 801 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 802 lprintf(("i")); 803 /* if the printer is ready for a char, */ 804 /* give it one */ 805 if ((sc->sc_state & OBUSY) == 0){ 806 lprintf(("\nC %d. ", sc->sc_xfercnt)); 807 lptintr(lptdev); 808 } 809 lprintf(("W ")); 810 if (sc->sc_state & OBUSY) 811 if ((err = tsleep((caddr_t)lptdev, 812 PCATCH, LPT_NAME "write", 0))) { 813 sc->sc_state |= INTERRUPTED; 814 return(err); 815 } 816 } 817 818 /* check to see if we must do a polled write */ 819 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 820 lprintf(("p")); 821 822 err = lpt_pushbytes(lptdev); 823 824 if (err) 825 return(err); 826 } 827 } 828 829 /* we have not been interrupted, release the ppbus */ 830 lpt_release_ppbus(lptdev); 831 832 return(0); 833 } 834 835 /* 836 * lpt_intr -- handle printer interrupts which occur when the printer is 837 * ready to accept another char. 838 * 839 * do checking for interrupted write call. 840 */ 841 842 static void 843 lpt_intr(void *arg) 844 { 845 device_t lptdev = (device_t)arg; 846 device_t ppbus = device_get_parent(lptdev); 847 struct lpt_data *sc = DEVTOSOFTC(lptdev); 848 int sts = 0; 849 int i; 850 851 /* we must own the bus to use it */ 852 if ((sc->sc_state & HAVEBUS) == 0) 853 return; 854 855 /* 856 * Is printer online and ready for output? 857 * 858 * Avoid falling back to lptout() too quickly. First spin-loop 859 * to see if the printer will become ready ``really soon now''. 860 */ 861 for (i = 0; i < 100 && 862 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 863 864 if ((sts & RDY_MASK) == LP_READY) { 865 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 866 sc->sc_backoff = hz/LPTOUTINITIAL; 867 868 if (sc->sc_xfercnt) { 869 /* send char */ 870 /*lprintf(("%x ", *sc->sc_cp)); */ 871 ppb_wdtr(ppbus, *sc->sc_cp++) ; 872 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 873 /* DELAY(X) */ 874 ppb_wctr(ppbus, sc->sc_control); 875 876 /* any more data for printer */ 877 if(--(sc->sc_xfercnt) > 0) return; 878 } 879 880 /* 881 * No more data waiting for printer. 882 * Wakeup is not done if write call was not interrupted. 883 */ 884 sc->sc_state &= ~OBUSY; 885 886 if(!(sc->sc_state & INTERRUPTED)) 887 wakeup((caddr_t)lptdev); 888 lprintf(("w ")); 889 return; 890 } else { /* check for error */ 891 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 892 (sc->sc_state & OPEN)) 893 sc->sc_state |= EERROR; 894 /* lptout() will jump in and try to restart. */ 895 } 896 lprintf(("sts %x ", sts)); 897 } 898 899 static void 900 lptintr(device_t dev) 901 { 902 /* call the interrupt at required spl level */ 903 int s = spltty(); 904 905 lpt_intr(dev); 906 907 splx(s); 908 return; 909 } 910 911 static int 912 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *p) 913 { 914 int error = 0; 915 u_int unit = LPTUNIT(minor(dev)); 916 struct lpt_data *sc = UNITOSOFTC(unit); 917 u_char old_sc_irq; /* old printer IRQ status */ 918 919 switch (cmd) { 920 case LPT_IRQ : 921 if(sc->sc_irq & LP_HAS_IRQ) { 922 /* 923 * NOTE: 924 * If the IRQ status is changed, 925 * this will only be visible on the 926 * next open. 927 * 928 * If interrupt status changes, 929 * this gets syslog'd. 930 */ 931 old_sc_irq = sc->sc_irq; 932 switch(*(int*)data) { 933 case 0: 934 sc->sc_irq &= (~LP_ENABLE_IRQ); 935 break; 936 case 1: 937 sc->sc_irq &= (~LP_ENABLE_EXT); 938 sc->sc_irq |= LP_ENABLE_IRQ; 939 break; 940 case 2: 941 /* classic irq based transfer and advanced 942 * modes are in conflict 943 */ 944 sc->sc_irq &= (~LP_ENABLE_IRQ); 945 sc->sc_irq |= LP_ENABLE_EXT; 946 break; 947 case 3: 948 sc->sc_irq &= (~LP_ENABLE_EXT); 949 break; 950 default: 951 break; 952 } 953 954 if (old_sc_irq != sc->sc_irq ) 955 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 956 unit, 957 (sc->sc_irq & LP_ENABLE_IRQ)? 958 "interrupt-driven":"polled", 959 (sc->sc_irq & LP_ENABLE_EXT)? 960 "extended":"standard"); 961 } else /* polled port */ 962 error = EOPNOTSUPP; 963 break; 964 default: 965 error = ENODEV; 966 } 967 968 return(error); 969 } 970 971 static device_method_t lpt_methods[] = { 972 /* device interface */ 973 DEVMETHOD(device_identify, lpt_identify), 974 DEVMETHOD(device_probe, lpt_probe), 975 DEVMETHOD(device_attach, lpt_attach), 976 977 { 0, 0 } 978 }; 979 980 static driver_t lpt_driver = { 981 LPT_NAME, 982 lpt_methods, 983 sizeof(struct lpt_data), 984 }; 985 986 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 987